The PTR KFR, HK91 that shoots 7.62x39mm!

Published on August 4, 2024
Duration: 18:57

This video provides an in-depth review and technical breakdown of the PTR KFR, a rifle chambered in 7.62x39mm that is based on the HK91/G3 platform. The presenter details its historical origins, technical specifications, and performance, including a demonstration of its disassembly and reassembly process. The review highlights the roller-delayed blowback system and its unique characteristics when firing the 7.62x39mm cartridge.

Quick Summary

The PTR KFR is a unique rifle based on the HK91/G3 design, chambered in 7.62x39mm. It utilizes a roller-delayed blowback system and is designed to accept AK-type magazines, though steel variants may have compatibility issues. Key features include a 16.35-inch heavy barrel, a 1913 Picatinny rail, and a fluted chamber for reliable extraction.

Chapters

  1. 00:08Introduction to PTR KFR
  2. 00:12PTR 91 / HK91 / H&K G3 Overview
  3. 00:52History of Roller Delayed Blowback
  4. 01:15West Germany and the G3 Adoption
  5. 01:43Different Calibers: 7.62 NATO, 5.56mm, 9mm
  6. 01:57The Obscure HK32 (7.62x39mm)
  7. 02:20PTR KFR: 7.62x39mm Derivative
  8. 02:32Rheinmetall Prototypes and AK Magazines
  9. 02:50HK32 Magazine Design
  10. 03:14HK32 vs HK33
  11. 03:23HK32 Prototypes in Mexico
  12. 03:43PTR's Role in US Production
  13. 04:24PTR Manufacturing and Tooling
  14. 04:44PTR KFR Rifle Breakdown
  15. 05:01Gen 2 Receiver with 1913 Rail
  16. 05:16Diopter Rear Sights
  17. 05:32Barrel Specs: 16.35" Heavy Profile
  18. 05:47Suppressor Compatibility (5/8x24)
  19. 05:54Roller Delayed System Explained
  20. 06:05AK Type Magazine Compatibility
  21. 06:09Magazine Issues with Steel Magazines
  22. 06:25Operating System: Roller Delayed Blowback
  23. 06:32No Last Round Bolt Hold Open
  24. 07:08Magazine Reliability with PMAGs
  25. 07:167.62x39mm Roller Delayed Blowback
  26. 07:21Semi-Automatic Only Configuration
  27. 07:30Selective Fire Potential with NFA Trigger Pack
  28. 07:33Barrel Specs: 16.35" Stress Relieved
  29. 07:381913 Rails and Handguard
  30. 07:41Polymer Slimline Handguard Critique
  31. 08:07Magazine Capacity (30-round PMAG)
  32. 08:14Overall Dimensions and Weight
  33. 08:18Trigger Pull Weight
  34. 08:24Disassembly Overview
  35. 08:34Simple Disassembly: Two Pins
  36. 08:57Removing the Stock Assembly
  37. 09:03Dropping the Trigger Pack
  38. 09:25Handguard Removal (Screwdriver Required)
  39. 09:32Removing the Bolt Carrier Group
  40. 09:41Bolt Carrier Group Design for Auto Sear
  41. 10:02Bolt Disassembly Complexity
  42. 10:44Bolt Reassembly
  43. 11:10Bolt Carrier Group Reassembly
  44. 12:32Reassembly: Bolt Carrier Group
  45. 12:40Reassembly: Trigger Pack and Stock
  46. 13:12Fluted Chambers Explained
  47. 13:17Fluted Chambers Aid Extraction
  48. 13:47Extractor Reliability with Fluting
  49. 14:01Range Test Introduction
  50. 17:19Shooting Impressions
  51. 17:34Recoil and Shooting Experience
  52. 17:40Trigger Feel
  53. 17:47Accuracy Results
  54. 18:11Ammunition Impact on Accuracy
  55. 18:35Brass Case vs. Steel Case Ammunition
  56. 18:50Conclusion and Call to Action

Frequently Asked Questions

What is the PTR KFR and what makes it unique?

The PTR KFR is a rifle based on the HK91/G3 platform but chambered in the 7.62x39mm cartridge. Its uniqueness stems from adapting the roller-delayed blowback system, typically found in 7.62 NATO or 5.56mm firearms, to fire the AK-47's common round, and its compatibility with AK-style magazines.

What are the key technical specifications of the PTR KFR?

The PTR KFR features a 16.35-inch heavy profile barrel with a 1:10 twist rate, threaded 5/8x24 for suppressors. It has a Gen 2 receiver with a welded 1913 Picatinny rail for optics and uses a roller-delayed blowback operating system. The trigger pull is approximately 9-10 lbs.

What kind of magazines does the PTR KFR use, and are there any compatibility issues?

The PTR KFR is designed to accept AK-type magazines. While PMAG Gen 2 and 3 magazines function reliably, the presenter noted that steel AK magazines often do not seat properly due to interference with the magazine well's tang. This requires careful magazine selection for optimal performance.

How does the roller-delayed blowback system of the PTR KFR perform with 7.62x39mm ammunition?

The roller-delayed blowback system, combined with a fluted chamber, aids in extraction and cycling. While the recoil is slightly heavier than gas-operated systems, the shooting experience is described as pleasant. The fluting is particularly beneficial for reliable extraction, even if the extractor is damaged.

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